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A hydraulic system for driving an axial piston type hydraulic motor wherein a swash plate can tilt at a right angle relative to a shaft. The hydraulic system comprises a swash plate cylinder; a double-acting swash plate piston disposed in the swash plate cylinder; one rod end of which is connected t

A hydraulic system for driving an axial piston type hydraulic motor wherein a swash plate can tilt at a right angle relative to a shaft. The hydraulic system comprises a swash plate cylinder; a double-acting swash plate piston disposed in the swash plate cylinder; one rod end of which is connected to the swash plate; a pair of springs disposed in the swash plate cylinder for biasing the swash plate piston; a swash plate piston control valve for selectively connecting one of the swash plate piston chambers to a hydraulic pump or, alternatively, for interconnecting the chambers of the swash plate piston; an inlet passage installed between an inlet port of the hydraulic motor and a hydraulic pump; an outlet passage installed between an outlet port of the hydraulic motor and a tank; a main control valve installed in the inlet passage for opening or closing the inlet passage in response to a predetermined signal; a passage switching valve installed in the outlet passage for opening or closing the outlet passage in response to a predetermined signal; a bypass passage installed in the outlet passage wherein each end of the bypass passage is connected to a predetermined position before and after the passage switching valve; and a relief valve installed in the bypass passage.

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[ What is claimed is:] [1.] A hydraulic system for driving an axial piston type hydraulic motor having a swash plate pivotably rotatable relative to a shaft, a cylinder block coupled to the shaft, and a plurality of reciprocating pistons being disposed in the cylinder block and further coupled to th

[ What is claimed is:] [1.] A hydraulic system for driving an axial piston type hydraulic motor having a swash plate pivotably rotatable relative to a shaft, a cylinder block coupled to the shaft, and a plurality of reciprocating pistons being disposed in the cylinder block and further coupled to the swash plate, the hydraulic system comprising:a cylinder;a swash plate piston received within said cylinder, said swash plate piston dividing said cylinder into a first chamber and a second chamber;a rod connecting said swash plate piston and the swash plate;a pair of springs disposed within each chamber, said springs exerting biasing forces on said swash plate piston;a first fluid passage connected to said first chamber;a second fluid passage connected to said second chamber;a piston control valve for selectively connecting said first and second fluid passages to a hydraulic pump and a tank or, alternatively, connecting said first fluid passage to said second fluid passage;an inlet passage provided between an inlet port of the hydraulic motor and said hydraulic pump;an outlet passage provided between an outlet port of the hydraulic motor and said tank;a main control valve provided within said inlet passage for selectively opening said inlet passage in response to a predetermined signal; anda remote control valve outputting a predetermined signal to said piston control valve and said main control valve.